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B. W. RIVERS.

CLOSURE FOR CONTAINING VESSELS.

APPLlCATlON FILED DEC. 18. 1917 Patented May-20, 1919.

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BENJAMIN 'W'ENTWOBTH RIVERS, (I? EQBTLAND, MAINE, ASSIGNOB TO INATIGNAL METAL SEAL GOREOLRATIQN, 0F DEER/ENG JUNGTIQN, PORTLAND, MAINE, A GOR- PORATION OF MAINE.

Specification of Letters Patent.

Patented May20, 1919.

Application fll'e'd December 18, 1917. Serial No.207fi85.

To allwnom it may concern:

Be it known that 1, BENJAMIN JV. Brvens,

' a citizen of the United States, residing at Portland, county of Cumberland, State of Maine, have invented certain new. and useful Improvements in Closures for {Jontaining Vessels, of which the following is a specification. I

This invention relates to closures for containing vessels and particularly to closures of the type of Letters Patent to John E. Doldt, #msaew and #1,192,1?3.

increase the sealing contact and to produce a more perfect completeness of seal under all conditions as Well as to provide additional. features of advantage all of which will be more fully set forth herein after.

In any closure which is to be used on containers for volatile or liquid content great difficulty has been experienced both 111 securin perfection of seal at the time of origina sealing and in permanency of that perfection under subsequent conditions, especially such as may involve any shrinkage of the compressible pack of the cap or re-= through the mouth of a container with clo-- sure in place.

Fig. 2 is an elevation of such closure mouth.

Fig. 3 is a plan view of the same.

Fig. 4 is a view of the bottom side of such a closure.

Fig. 5 is aside elevation thereof.

Fig. 8 is a central vertical section of such a closure removed.

' ing from the to Fig. 7' is a similar section of a slightly modified form.

Fig. 8 is an enlarged side view of a lug, and I 1- Fig. 9 is a view of the lead end of such a In the practice of my invention a container 1 of any shape or material is provided below its mouth 2 with a suitable number of lugs 3. according to the size of the container mouth to ailordsuitable bear.

I ing for the cap. It is the object of the present invention to The closure 4 comprises a top disk 5 which is normally slightly dished or concaved as appears in Figs. 6 and 7. Depend- 5 is an annular skirt 6 which is prefera ly knurled. This skirt 6 terminates in segmental inturned lips: 7 These lips 7 are of greater length than the lugs 3 and in efiec't subtend an inclosing arc of the adjacent skirt 6 in somewhat of a truss arrangement. They thus have when drawn underthe lugs 3 a strong drawing down actionon margins of the to 5 included by or adjacent to the arcs su tended by the lips 7.

This action is an important one as tightness and uniformity of seal is im ortant and. even indispensable in preserving the usual container contents.

It will be noted in Fig. lthat the bearing of the top 5 and that of its underlying pack 8 is on the mouth 2 somewhat within the skirt 6. In order to make the hearing of these parts as direct and complete as possible under the marginal strain of the lug engagement of the lips 7 I provide "the slight dishing of the top 7 so that under the sealing strain it may yieldingly seat on the mouth 2 with completeness of contact.

The lugs 3 have preferably a somewhat extended under bearing surface?) although bein preferably comparatively shorter than the fips 7.- The desired construction being of a length of lug which willigive a slightly extended bearing on its usr ce 3 to the engaged area of the lip 7 so that while giving full adjusting movement it will not tend to buckle the li locally.

The end of t e lug 3 is provided with a lead 3 with which the advancing end of the lip 7 may progressively engage as it is guided under stress to the bearing face 3 Each lip 7 is furthermore provided with a stop 9 formed by an indentation in'the following end of the lip 7.

The stop 9-being in the form of an indentation or embossment does not interfere with the general resiliency of the lips 7 although it does produce a proper local rigidity adjacent the end of the lip outside of the bearing portion of the lip which engages the lug 3. The stop 9 owing to its position moves in a path during the rotation of the cap which brings it against the rounded lead end of the lug 3. It therefore affords a substantially positive stop, but one with an engagement which does not tend to chip the lug which in practice is frequently of glass or other frangible material.

The lug 3 has been referred to as having a substantially flat lower bearing surface as appears in the enlarged views in Figs. 8 and 9. This surface is preferably not a truly horizontal surface but is very slightly pitched downward giving a slightly increased tension to the inner edge of the lip 7 and at the same time affording a convenient draft for the removal of the mold members. This'is indicated in Figs. 8 and 9 at 3 The lug 3 is further provided at its forward end with a rounded lead 3 which afiords a progressive engagement with the lip 7 and a non-chipping contact with the stop 9.

It will be noted that the dished construction as indicated in somewhat exaggerated form in Fig. 6 may be variousl modified. As shown in Fig. 7 the concavity may be annular and disposed about a raised central portion as is frequently found convenient for the purposes of embossment.

Various other modifications may be made in the structure of the cap and in the container month all without departing from the spirit of my invention if within the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is: I

1. In combination with a container having a lug, a closure having a lip adapted to engage said lug upon rotation of the closure in one direction, said lip having a stop adapted to contact the leading end of the lug to limit the rotation of the closure in its seating direction.

2. In combination with a container having a lug, a closure having a lip adapted an indentation near its following end adapted to contact said leading end of the lug and limit the rotation of the closure in its seating direction, and said indentation acting as a stiffener to brace the lip against permanent distortion.

4. In combination with a container having a lug, a closure having a lip adapted to engage said lug upon rotation of the closure in onedirection, said lug and lip having a stop engagement adapted to limit the rotation of the closure in its seating direction.

5. In combination with a container having a lug, a closure having a lip adapted to engage said lug upon rotation of the clodirection.

7. In combination with a container having a plurality of spaced lugs about its mouth, a closure comprising a cap having a depending skirt provided with a plurality of spaced inturned resilient lips trussing said skirt and adapted to engage said lugs, said lips having indentations near their following ends and said indentations stiffening the lips and adapted to contact the leading ends of the lugs to limit the rotation of the closure in its seating direction.

In testimon whereof I affix my signature in presence 0 two witnesses.

BENJAMIN WENTWORTH RIVERS.

Witnesses:

ELIZA BARNARD, LAUREN M. SANBORN. 

